Working with dates in JavaScript requires understanding the Date object and its quirks. Here's a comprehensive guide.
Creating Dates
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Getting Date Components
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Setting Date Components
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Formatting Dates
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Custom Formatting
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Date Arithmetic
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Comparing Dates
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Start/End of Period
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Parsing Dates
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Timezone Handling
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Best Practices
Creation:
✓ Use ISO 8601 strings
✓ Use Date.UTC for UTC dates
✓ Validate parsed dates
✓ Remember months are 0-indexed
Formatting:
✓ Use Intl.DateTimeFormat
✓ Store dates in UTC
✓ Display in user's timezone
✓ Use ISO for APIs
Manipulation:
✓ Create new Date objects
✓ Handle month overflow
✓ Use UTC for calculations
✓ Consider timezone differences
Avoid:
✗ Parsing ambiguous formats
✗ Mutating date objects
✗ Ignoring timezones
✗ Using deprecated methods
Conclusion
JavaScript's Date object has quirks (0-indexed months, mutable methods) but is powerful when used correctly. Use ISO 8601 strings for parsing, Intl.DateTimeFormat for locale-aware formatting, and always consider timezones when storing and displaying dates. For complex date manipulation, consider libraries like date-fns or Luxon, but the native Date API handles most common cases effectively.